Thermostat attachment



Dec. 11,1923. 1,477,350

H. A. HOESCHEN THERMOSTAT ATTACHMENT Filed Aug. 6, 1920 K -I I I I HI IJI 1 fi "J 3 M; A 27 5 A, r E Fly. 3. lb a Ii? 20 J g m c? H 28 I I AJLmL w. 1L5 mg Patented Dec. 11, 1923.

UNITED STATES PATENT OFFICE.

HENRY A. HOESCHEN, OF OMAHA, NEBRASKA, ASSIGNOR OF ONE-HALF TO BAKER ICE MACHINE COMPANY, OF OMAHA, NEBRASKA, A CORPORATION.

THEBMOSTAT ATTACHMENT.

Application filed August 6, 1920. Serial No. 401,715.

To all whom it may concern:

Be it known that I, HENRY A. HoEsoHEN,

a citizen of the United States, residing at Omaha, in the county of Douglas and State of Nebraska, have invented certain new and useful Improvements in a Thermostat Attachment, of which the following is a specification.

This invention relates to a thermostat attachment, and has for its object, broadly, to provide a magnetic control for preventing undulations and to cause rapid action of the metallic arm of the thermostat so that said arm will be practically devoid of vibration while moving transversely to electrical contact pieces from the effects of changes in temperature, the device being adapted for use generally for a great variety of purposes and particularly useful in connection with the heating of furnaces and for the process or operation of refrigeration.

In the accompanying drawing, Fig. 1 is a plan view of the device, a cover being shown and broken away. Fig. 2 is a side view of the same, a part of the spring of the thermostat being broken away, the cover and base being in section on line 22 of Fig. 1. Fig. 3 is a diagrammatic view to illustrate one of the uses of the device.

Referring now to the drawing, numeral 1 indicates an electrically insulated, metallic base for the thermostat, said base being secured upon an apertured support or insulating-plate 2 by any suitable means, a screw and nut indicated respectively at 3 and 4 being shown for this purpose. Numerals 5, 6 and 7 indicate metallic posts which are provided for the base 1.

The thermostat consists of a metallic spring 8 provided with a rectilinear, met aling and moving said arm transversely, consisting of a helical spring 10 carried by the post 6 and adapted to bear upon the rectilinear part b of the spring 8. and a set-screw l1 threaded in the post 7 and adapted t) bear upon that side of the part 7! oppositii to the spring 10: and while I do not wish to be limited in the use of material, the

members 1. 5, 6, 7, and 9 are preferably constructed of brass or similar electricalconduct-ing material, members 8 and 9 being unequal co-eflicients of expansion.

At 12 is indicated a magnet which is secured stationary with the insulating-plate by any suitable means, the means herein shown being a pair of clamping-plates 13 and 13' engaging the bars or poles c and 0' of the magnet and secured to the insulating plate by means of a screw 14, the arrangement being that the arm 9 will normally be disposed adjacent to and above the magnet in a plane midway between the planes of the poles 0 and a of said magnet.

In order that accuracy in operation may be attained, the bars 0 and c are provided with a pair of opposed adjusting pole-members or projections 15 which are threaded therein so that their inner ends may be disposed at suitable distances apart. and may be equidistant from the tongue 00, preferably constructed of iron and which is mounted upon the terminal of the arm 9.

Numerals 16 and 16 indicate a pair of posts disposed outwardly of the bars 0 and c and which are stationary with the insulating-plate 2, said posts having a pair of adjusting-screws 17 threaded therein near their upper ends, operating as electrical conductors and disposed in alignment, each screw 17 preferably being provided at its inner end with an electrical contact-piece or carbon tip indicated at d and d, and "it will be understood that by rotating member 11, an adjustment may be made for the position of arm 9 so that it may normally be disposed equidistant from members d and d and equi distant from members 15.

Numeral 18 indicates an apertured case or cover. which, together with the insulating plate 2 provides a housing for the metallic parts mentioned, and the device may be suppo'rtedupon its legs 19, and it'will be understood that if the degree of temperature in the casing is increased the arm 9, on account of expansion. will move toward the carbon tip (Z. and if the temperature is decreased the metallic arm 9, on account of contraction, will move toward the carbon tip at.

At e and (I are indicated a pair of elongated, metallic wings which are secured to the arm 9 between the ends thereof and which lie at the sides of and are normally disposed parallel with said arm, their ends preferably being provided with bearingplates f and f, each normally being d sposed between the arm 9 and a carbon tip, said wings preferably being of attenuated form and constructed of steel or other elastic metal operating, resiliently, to resist, in a, slight degree, the transverse movements of the arm 9, after engagement of said plates with the tips.

The primary object in view in the use of the magnet and parts mentioned is to cause rapid movements of the arm 9 for engagement, without appreciable vibration, of its wings with said carbon tips, the quick movement of said arm, after one of its wings has been disengaged from one of said tips, to an engaged relation of its opposite wing with the other carbon tip, being of great advantage, and quite necessary, in instances where maintenance of a practically uniform temperature is required, the operation being that the plate f of the wing e of the thermo stat will be moved into contact and will be maintained in engagement with the carbon tip 03 when there has been achange to a comparatively hi h degree of temperature, the plate f of t e wing e, on account of the change to said high temperature, being disengaged from the carbon tip at, the action of the magnet tending to resist disengagement of member f from member d. However, the expansion of the thermostat occasioned by the change to the high degree of temperature will cause the disengagement mentioned, and on account of the use of the magnet, the movement of the arm 9 toward member (1 will be very rapid, and any rebounding of the arm from member d will be prevented since the wings are of at* tenuated form, and said wing 6 will be maintained in engagement with member d without appreciable vibration.

To illustrate utility of the device I have shown an electrical circuit consisting of electrically energized conductors g in communication with the arm 9 of the thermostat and with a pair of solenoids 20 and 21 the latter being in electrical communication with members 03 and d, and it will be understood that if the arm 9, actuated by the temperature, engages member d, the electrical circuit will then be established between the battery 22'and the solenoid21.

Actuation of the solenoid 21, thus'efi'ected, will cause operation of the motor 23 from the main supply lines 24 and 25, an electrical switch 26 being provided and being actuated by the solenoid 21 to cause the switch 26 to engage the electrical contact-piece 27.

hen the temperature changes, and the arm 9 engages member (l the operation will be similar to that described and the motor 28 will be actuated, operation of the motor 23 ceasing. While two motors are shown in Fig. 3, both motors or a single motor may be used for any desired purpose.

Numerals 29 indicate set-screws engaging in posts 16 and 16 for preventing any revolvable movement of the screws 17. After adjustments have been made of members 15 and 17 as described, no further changes Will be required, member 11 being depended upon for adjustments of the thermostat.

It will be appreciatedthat accurate adjustments for the thermostat is an important matter, and it is considered that the base 1 and the three posts 5, 6 and 7, in combination with the screw 11 and spring 10 operate to great advantage for this purpose.

It will be understood that other insulating means may be substituted for the plate 1, so that the electrical circuit as described maybe operative; also that other objects than the motors shown in Fig, 3 and which may be remote from the strip 9 and actuated may be employed, and the solenoids have been specifically mentioned, other equivalent members may be used in an electrical circuit which includes the strip 9 and members 17; also changes in form, size, proportion and minor details may be made as found to be of advantage, said changes to be determined by the scope of the invention as claimed.

What I claim as new and desire to secure by Letters Patent is,-

1. The combination of a support, a metallic strip curved between its ends, said strip having a rectilinear part disposed in the plane of its curved part and secured to the support, a pair of electrical contact-pieces stationary with the support and disposed at the respective sides of the strip, a magnet approximately of U-shape stationary with the support and disposed with its arms at the respective sides of the strip, a pair of resilient wings at the sides of and secured to the strip, each wing being disposed between the strip and an electrical contactpiece, and means connected with the support" and engaging the rectilinear part of the strip for controlling a movement of that part of the strip adjacent to the electrical contact-pieces.

. 2. The combination with a support and a metallic strip having a rectilinear endportion and a second rectilinear end-portion and having a curved art between said rectilinear end-portions, t e first named rectilinear end-portion of the strip being disposed in the plane of the curved part and secured to the support, of a pair of electrical con end-portion, a magnet approximately of U- shepe secured to the support and having projections disposed in a plane between the second rectilinear end-portion of the strip and said support at the respective sides of the tongue, and means on the support for moving the first named rectilinear end-portion of the stri transversely for movin the second rectilinear end-portion tower 

